Trust & security
Legally sound, tamper-evident and data-minimal — by design.
DUOLEXX is built for what matters: a binding legal language, provable signature integrity and a disciplined approach to your data.
Authoritative legal language
Every document is created in its country's legal language as the binding version — the translation aids understanding, not interpretation.
Signature with integrity proof
On first signature the content is frozen and hashed with SHA-256. So it's provable that both parties signed the same wording.
Documents belong only to you
Access is controlled per document — no one but the authorized reads your content.
Copy protection before payment
Unpaid previews are protected against simple copying and printing; after purchase you get the clean PDF.
Keys stay server-side
Powerful server keys live only in the server runtime — never in the browser, never in the code bundle.
Data-minimal & GDPR-minded
We collect what the document needs — no third-party trackers in the core flows. Payments run securely via Stripe.
Privacy & security — engineered, not just promised
We treat your contracts as what they are: confidential documents. That's why privacy at DUOLEXX is built into the technology, not just written into the terms.
Encrypted at rest
Document contents and signatures are stored AES-256 encrypted. A database dump or stolen backup stays unreadable.
No reading in operation
No admin function shows contract contents — the team only sees metadata like document type and status, never the text.
Tamper-proof seal
Every signature is cryptographically sealed (Ed25519) and can be verified publicly, independently of us.
Data minimal
IP addresses are stored only as a hash, there is no ad tracking, and analytics run without cookies.
Hosted in the EU
Run on our own server in the EU, with no sharing of your content with ad networks or AI training data.
/api/verify — Every signature is cryptographically sealed (Ed25519) and can be verified publicly, independently of us.
Honest note
The clauses are carefully researched but don't replace individual legal advice. For high-stakes cases we recommend a lawyer's review.